[ -Ing and Infinitive Verb Patterns ]
I usually forget _____ the lights off.
A. turning
B. to turn

Random Topics:
Passive SentencesWho vs WhomVerbs - third personPresent Perfect or Past SimplePreposition and ConjunctionCommon & Proper NounsFunctional Sentence TypesModal Verb, Passive VoiceFirst Conditional, Future Time ClausesConditional TensesOther quiz:
Grammar › ViewThis picture __________ the contamination of ground water.
A. illustrate
B. illustrating
C. illustrated
D. illustrates
Grammar › View
When did you __________ your mother?
A. visit
B. visited
C. visitted
Conjunction › ViewThey have a big collection of paintings ___ Picasso.
a. at
b. by
c. with
Present Tenses › View
The birds are flying in the air.
A. Present Perfect
B. Present Perfect Continuous
C. Present Continuous
D. Present Simple